Hi I’ve 23 WH Caviar Black hard drives (mostly 2Tb), 10 of them permanently attached to my system (in ventilated enclosures), for the rest I use a docking station. Recently 2 of them have completely failed and a third is reporting bad sectors (all of them the 2Tb variety and permanently mounted). My PC runs 24/7. I have a Gigabyte EX58 mainboard, a BFG 1200W power supply and the entire PC is protected by a Powerware UPS.
My question is: What causes bad sectors? I know everything will eventually fail, but my drives are less than 2.5 years old. I take what I consider to be good care of them - they are not subjected to moisture, vibration, knocks or bumps. They are not allowed to overheat, they have good, clean and sufficient power supplied to them. I clean the inside of my PC case of dust about twice a year. The cables are of good quality, as is the rest of my PC. They are defragged every couple of weeks and checked for errors once every 2 or 3 months. But in spite of this, drives that are guaranteed for 5 years are failing before half of that time has passed.
What could be causing them to develop bad sectors and eventually fail? I can (possibly) understand 1 out of 23 (just over 4%) - but THREE??? That’s over 13% failure rate!! Unacceptable!!